Question

为防止水结冰,可加入甘油降低凝固点,若将冰点降低至-2℃,每一百克水中应加入甘油多少克?

Answer 1

需要查水的Kf=1.86K/mol/K;

△Tf=Kfmb=1.86×n(甘油)/0.1Kg=2;

n(甘油)=0.1075mol;

m=0.1075×92=9.89g;